another question when subtracting vectors, do you just change the arrowhead of the negative vector of do you move the entire arrow to face the other direction?

I don't understand ?

I think... :
If you want to draw a vector substracted to another, draw a line parallel to the vector, starting at the endpoint of the vector to which you are going to substract, but going the opposit direction.

2.) If m = 3i - 2j and n = i + j

a.) show that 2m + 4n is parallel to the x-axis

i know how to do the substitution bit, but how do i show that it is parallel

thanks alot guys

The x axis is defined by .
That is to say that a vector is parallel to the x axis if and only if there exists k, such that